CDL Combination Vehicles Practice Test Results

Question 1
73% answer correctly
Where are the shut off valves?
At the back of the tractor
At the back of trailers
At the front of trailers
In the tractor cab
Question 2
73% answer correctly
What is the maximum amount of air that a combination vehicle air brake system should leak in one minute with the brakes released and the engine off?
4 psi
3 psi
1 psi
2 psi
Question 3
82% answer correctly
Before backing under a trailer that you`ve just hooked to your tractor you should:
Make sure the fifth wheel has been removed
Hook up the electrical lines
Hook up the service and emergency lines
Ground the trailer